%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example A-3-5 on page 873.
%%
%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
%%    Johannes Braams, David Carlisle, and Chris Rowley
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{111.0pt}
\StartShownPreambleCommands
\usepackage{ifthen,shortvrb}  \MakeShortVerb\|
\StopShownPreambleCommands
\begin{document}
\newcommand\BB{\CC}\newcommand\CC{\DD}
\newcommand\DD{AA} \newcommand\EE{EE}
|\BB|=|\EE|?  \ifthenelse{\equal{\BB}{\EE}}{True}{False}.\par
|\BB|=|\CC|?  \ifthenelse{\equal{\BB}{\CC}}{True}{False}.\par
|\DD|=|\BB|?  \ifthenelse{\equal{\DD}{\BB}}{True}{False}.
\end{document}